<template>
  <div class="my-tab-bar">
  	<div class="tab-item" v-for="(item,index) in  list" :key="index"
    :class="{current:index===activeIndex}"
    @click="clickFn(index,item.componentName)"
    >
      <!-- 图标 -->
      <span class="iconfont " :class='item.iconText'></span>
      <!-- 文字 -->
      <span>{{item.text}}</span>
    </div>
  </div>
</template>

<script>
export default {
  data(){
    return{
      activeIndex:0
    }
  },
  props:{
    list:{
       type:Array,
    require:true,
    validator(val){
        if(val.length<2||val.length>5){
          console.error('props list must between 2 and 5 node ');
          return false
        }
        return true
    }
    }
   
  },
  methods:{
    clickFn(index,componentName){
      //当前的索引 等于点击的索引
      this.activeIndex=index
      // 子传父 把自定义事件名 和组件的名字传给父组件
      this.$emit("changeCom",componentName)
    }
  }
}
</script>

<style lang="less" scoped>
.my-tab-bar {
  position: fixed;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 50px;
  border-top: 1px solid #ccc;
  display: flex;
  justify-content: space-around;
  align-items: center;
  background-color: white;
  .tab-item {
    display: flex;
    flex-direction: column;
    align-items: center;
  }
}
    
.current {
  color: #1d7bff;
}
</style>